On Friday, February 20, 2015 at 4:04:02 PM UTC-6, DerbyDad03 wrote:

1 - The notched brackets and cleats used for the adjustable shelves in the center section.


That notched design dates back to, at least, the 1820s. Here's 2 pics of a 1820s china hutch that has a similar notched (adjustable) shelf bracing.
Cabinet: https://www.flickr.com/photos/43836144@N04/16409673160/ (and how about those recently upholstered dining chairs!!!)
Bracing: https://www.flickr.com/photos/43836144@N04/16409535770/


Just so happens, I plan to use this bracing technique on/in the gun cabinet, i.e., being able to (easily) remove the 2 gun rack aspects and install adjustable shelves. I happen to have just enough of those old boards, remaining, to make 3 shelves.

Sonny